Kata_js_formatDuration.js

//https://www.codewars.com/kata/52742f58faf5485cae000b9a/train/javascript


function formatDuration(seconds) {
    if(seconds == 0 ) return "now";

    t = Number(seconds);
    var y =  Math.floor(t / (3600*24*365));
    var d = y > 0 ?   Math.floor(t % (3600*24*365) /(3600*24))              : Math.floor(t / (3600*24));
    var h = d > 0 ?   Math.floor((t % (3600*24*365)) %(3600*24) /(3600)  )  : Math.floor(t / 3600);
    var m = Math.floor(t % 3600 / 60);
    var s = Math.floor(t % 3600 % 60);


    var display=[];
    y > 0 ? display.push(y + (y == 1 ? " year" : " years")) : "";
    d > 0 ? display.push(d + (d == 1 ? " day"  : " days" )) : "";
    h > 0 ? display.push(h + (h == 1 ? " hour" : " hours")) : "";
    m > 0 ? display.push(m + (m == 1 ? " minute" : " minutes")) : "";
    s > 0 ? display.push(s + (s == 1 ? " second" : " seconds")) : "";

    return display.join(", ").replace(/,([^,]*)$/," and$1");
  }

log(1,formatDuration(1), "1 second");
log(60,formatDuration(60), "1 minute");
log(120,formatDuration(120), "2 minutes");
log(61,formatDuration(61), "1 minute and 1 second");
log(62,formatDuration(62), "1 minute and 2 seconds");
log(121,formatDuration(121), "2 minutes and 1 second");
log(122,formatDuration(122), "2 minutes and 2 seconds");
log(120,formatDuration(120), "2 minutes");
log(3600,formatDuration(3600), "1 hour");
log(3662,formatDuration(3662), "1 hour, 1 minute and 2 seconds");
log(15731080,formatDuration(15731080), "182 days, 1 hour, 44 minutes and 40 seconds");
log(132030240,formatDuration(132030240), "4 years, 68 days, 3 hours and 4 minutes");
log(3662,formatDuration(3662), "1 hour, 1 minute and 2 seconds");
log(15731080,formatDuration(15731080), "182 days, 1 hour, 44 minutes and 40 seconds");
log(205851834,formatDuration(205851834), "6 years, 192 days, 13 hours, 3 minutes and 54 seconds");
log(3545364,formatDuration(3545364), "41 days, 49 minutes and 24 seconds");




function log (a,b,c){

     console.log("formatDuration("+a+") = ",b," == ",c," - ",b==c)
}